Process of making solutions of bisulphites



NB Model. I 2 Sheets-sheet 1. EUGEN BARON BITTER 8t CARL KELLNER. PROCESS OF MAKING SOLUTIONS OF BISULPHITBS..

No. 329,216. t Patented Oct. 27, 1885'.

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WITNESS I 1 ENTORS Mam .dttorney 3 (No Model. 2 sheets-sheet 2;

BUGEN BARON BITTER & CARL KELLNER. PROCESS OF MAKING SOLUTIONS 0F BISULPHITES.

No. 329,216. Patented Oct. 27, 188.5

lmnlllmllml WITNESSES 1.7V V'EJV' TORS UNITED STATES PATENT OFFICE.

EUGEX BARON BITTER AND CARL KELLNER, OF PODGORA, NEAR GOERZ, AUSTRIA-HUNGARY, ASSIGNORS TO \VILLIAM -A. RUSSELL, TRUSTEE, OF

L :UYRENCE, MASSACHUSETTS.

PROCESS OF MAKING SOLUTIONS OF BISULPHITES.

SPECIFICATION forming part of Letters Patent No. 329,216, dated October 27, 1885.

Application filed February 4, 18:5. Serial No. 154.861. (No specimens.) Patented in Austria-HungaryAugust2,1858, No. 10,024 and No. 31,730; in France September :27, 1883, No. 157,754; in Belgium September .19, 1853, No. 62,746, and in Italy January 22, 1884,

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T c all whom, it may concern:

lie it known that we, EUGEN' BARON BITTER and CARL Kl-JLLNER, subjects of the Emperor ol'Austriallungary, residing at Podgora, near (iOUlZ, i-Xustria-Hnngary, have invented a certain new and useful P1 ocess of Producing Double-Salt Bisnlphite Solutions for the Mannfacture of Cellulose or Paper-Pulp, (the said invention having been patented to us in Italy January 22, 1884, No. 16,316; in France Septcinber 27,1883, No. 157,754; in Belgium September 29, 1883, No. 62,746, and in Austrialungary August 2, 1883, No. 20,024 and No. 31,7 30;) and we do hereby declare the following to be a full, clear, and exact description of the invention, reference being had to the accompanying drawings,which form part of this specification, in which- Figure 1 is a vertical transverse section of the apparatus employed for carrying our invention into effect. Fig. 2 is a horizontal section of the same. Fig. 3 is a vertical longitudinal section, and Fig. i a sectional view of a detail.

In an application of even date herewith we have described and shown the apparatus constituting the plant for the production of bisulphites by the combination of sulphnrous acid with a suitable base or bases, and this application is intended to embody the process which said apparatus is best adapted to carry into effect.

As a process,our present invention consists in first subjecting the carbonate of a base to the action ol'sulphurous acid,whereby the carbonic acid is expelled and the sulphite so formed dissolved in the weakened acid solution, and then reimpregnating the sulphite solution with sulphnrous acid, and again effecting a combination with the second base and the formation of a double salts, in which more than two molecules of the acid are combined with one molecule of each base.

The apparatus for carrying out the process which forms the subject-matter of the present application having been made the subjectmatter of another application, as aforesaid,we

will herein describe the same, but briefiy,s0

as to facilitate the understanding of the various steps of the process, and without describing in detail the minor parts.

This apparatus may be stated to consist of the following elements, namely: an absorption-chamber, A, subdivided into communieating compartments B G D E F, provided with gratings to receive coke or limestone, and connect'ed through suitable pipes and sluice-valves with a gas-supply; a series of liquid reservoirs, G- H I J K, on top of and communicating respectively with said compartments; a series of basins, L M N O P, with pipes leading to said reservoirs by way of intermediate pumps or deliverydevices, and with said compartments by means of discharge pipes or conduits, whereby the gases and liquids are caused to circulate through said compartments in opposite directions; boxes Q R, adapted to contain carbonates of the bases; meters S T, arranged at the entrance and discharge ends of said boxes and communicating therewith, and pipes leading in series from one compartment of the absorption chamber to the box Q, thence to the reservoir-basin P, next to the compartment F, thence to the box R, and finally to the reserve basin P.

The successive steps of our process are as follows: The compartments B O l) E F are first charged with coke or limestone and the boxes Q R with layers of carbonate deposited in a methodical manner. Now sulphnrous acid is admitted from the supply through one or the other of the sluice-boxes to the compartments, through which it circulates seriatim,while at the same time water is led from the basin L,

sulphnrous-acid solution chemical] y combines with-the base contained in the box Q, producing a sulphite solution. Leaving the box Q,

thesulphite solution passes into the basin P, and is from this basin conveyed into the compartment B,wh ere it again meets the sulphurous acid and is again impregnated. Leaving compartment B, the sulphite solution is conveyed to the box R, wherein it meets the carbonates of the second base, combines therewith, and is converted into a double salt having more than two atoms of sulphurous acid to one atom of the base.

Instead of carbonates, hydrates may be employed in the boxes Q B.

This process is materially assisted and accelerated by the momentary formation of bicarbonate, which is produced by the dissolving action of the liberated carbonic acid upon the adjacent portions of the carbonate, but is immediately converted by the stronger sulphurous acid into bisulphite. In practice we have found, however, that if the carbonates are employed in pieces they are coated with a covering of sulphite, which covering offers an obstacle in the way of further decomposition.

Having described our invention, we claim- 1. The process or method of producinga by first bringing a solution of sulphurous acid 5 and water in contact with one of the bases, and thereby forming a sulphite solution, then reimpregnating the sulphite solution with sulphurous acid and bringing the same in contact with a second base, substantially as described.

In testimony that we claim the foregoing we have hereunto set our hands.

EUGEN BARON BITTER. CARL KELLNER.

Vitnesses:

GEORG MARTIN, J OHANN LUTTMANN. 

